<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>分区标签</title>
   <style>
      div{
        border: 1px solid red;
        margin: 100px;
        padding: 100px;
      }
   </style>
    <link  rel="stylesheet" href="my.css">
  <style>
    span{
      border: 1px solid cyan;
    }
  </style>
</head>
<body>
<div>块级分区标签1</div><div>块级分区标签2</div><div>块级分区标签3</div>
<span>行内标签1</span>
<span>行内标签2</span>
<span>行内标签3</span>
<h2>dsgfdgdfgdf</h2>
<h3>dfgerghsrth</h3>
</body>
</html>